560 



The Genesis of Double Stars 



light-curve. In the circumstances, however, I have not thought it 

 worth while to reproduce Dr Roberts's provisional figure. 



I now turn to the conclusions drawn a few years previously by 

 another observer, where we shall find the component stars not quite 

 in contact. This is the star ft Lyrae which was observed by Goodricke, 



Argelanc/er's Curve 

 Computed Cur re. 



Fig- 7. 

 The light-curve and system of /3 Lyrae. 



Argelander, Belopolsky, Schur, Markwick and by many others. The 

 spectroscopic method has been successfully applied in this case, and 

 the component stars are proved to move in an orbit about one another. 

 In 1897, Mr G. W. Myers applied the theory of eclipses to the light- 

 curve, on the hypothesis that the stars are elongated ellipsoids, and 

 he obtained the interesting results exhibited in Fig. 7 1 . 



1 Astrophysical Journ. Vol. vii. (1898), p. 1. 



